-28.54% is the change from 939 to 671
Calculation steps:
[( 671 - 939 ) ÷ 939] x 100 = -28.54%
Formula
Percentage change = [(671 - 939) / 939] x 100
Subtract the new number by the original number
671 - 939 = -268
-268 ÷ 939 = -0.2854100106496273
-0.2854100106496273 x 100 = -28.54%